Thanks, and what do you recommend I change the stats to? In example: [SPEED:1000]
[DAMBLOCK:25] etc.
Well, I advise you to look at other megabeast stats. For example, the Bronze Colossus has a damblock of 8 and is, as far as I know, the most annoying megabeast. 25 or 30 should be good. Speed should be lower than 1000. He can
fly and should be faster than an elf who has [SPEED:700]. A speed value of 400 (or 300, if you dare) should be deadly enough. Genpower can be removed, it's not used anymore. [SIZE:50] is incredibly giant, but okay, I guess. Set it to [SIZE:40], so it'll be twice as big as a normal dragon.
Now about the attack... With [SIZE:40], basically everything is ridiculously powerful. I would say 5:10 (which is much more powerful than any vanilla attack), but if you want, you could buff it up to 10:15. I have no idea how powerful that exactly is, but compared to vanilla DF, this dragon is the avatar of Armok. But then, you should definitely nerf your other custom creatures. Unicorns with [10:60] is much to powerful.
Also, you should definitely add some spheres to it. With the "POWER"-token it can be worshipped by any entity with "RELIGION:ANY_APPROPRIATE_POWER", for example gobbos. Appropiate spheres should be:
[SPHERE:FIRE]
[SPHERE:SUN]
[SPHERE:PREGNANCY] (lol)
Look
here for a list of spheres.
You can make it even more dangerous by adding [CAN_LEARN]. Then, it can actually gain experience and become faster, better and all in all more badass than ever!
Edit: Wow, what stats does your titan have? O_o You shouldn't compare modded creatures to other modded creatures because it's always possible to make it even
more powerful. Except when you do a Total Conversion, but I doubt that you do such a thing.